4CDJ image
Deposition Date 2013-11-01
Release Date 2014-01-08
Last Version Date 2024-10-16
Entry Detail
PDB ID:
4CDJ
Keywords:
Title:
Structure of ZNRF3 ectodomain
Biological Source:
Source Organism:
MUS MUSCULUS (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.50 Å
R-Value Free:
0.17
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:E3 UBIQUITIN-PROTEIN LIGASE ZNRF3
Gene (Uniprot):Znrf3
Chain IDs:A, B
Chain Length:164
Number of Molecules:2
Biological Source:MUS MUSCULUS
Primary Citation
Structures of Wnt-Antagonist Znrf3 and its Complex with R-Spondin 1 and Implications for Signaling.
Plos One 8 83110 ? (2013)
PMID: 24349440 DOI: 10.1371/JOURNAL.PONE.0083110

Abstact

Zinc RING finger 3 (ZNRF3) and its homolog RING finger 43 (RNF43) antagonize Wnt signaling in adult stem cells by ubiquitinating Frizzled receptors (FZD), which leads to endocytosis of the Wnt receptor. Conversely, binding of ZNRF3/RNF43 to LGR4-6 - R-spondin blocks Frizzled ubiquitination and enhances Wnt signaling. Here, we present crystal structures of the ZNRF3 ectodomain and its complex with R-spondin 1 (RSPO1). ZNRF3 binds RSPO1 and LGR5-RSPO1 with micromolar affinity via RSPO1 furin-like 1 (Fu1) domain. Anonychia-related mutations in RSPO4 support the importance of the observed interface. The ZNRF3-RSPO1 structure resembles that of LGR5-RSPO1-RNF43, though Fu2 of RSPO1 is variably oriented. The ZNRF3-binding site overlaps with trans-interactions observed in 2:2 LGR5-RSPO1 complexes, thus binding of ZNRF3/RNF43 would disrupt such an arrangement. Sequence conservation suggests a single ligand-binding site on ZNRF3, consistent with the proposed competing binding role of ZNRF3/RNF43 in Wnt signaling.

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